Amplification Relay Device of Electromagnetic Wave and a Radio Electric Power Conversion Apparatus Using the Above Device

ABSTRACT

The present invention provides an amplifying repeater, which is constructed in such a manner that a ferrite core is inserted into a coil with a pre-determined number of winds to increase an induced electromotive force caused by an increase in flux linkage using a time-varying magnetic field of electromagnetic waves at a position distant from various electromagnetic wave generating sources by a predetermined distance and the induction coil and a variable condenser for inducing resonance are connected to each other to increase current while reducing a resistant component existing in the induction coil to intensify and amplify the magnetic field of electromagnetic waves. Furthermore, the present invention provides a wireless power conversion charging device using the magnetic field of electromagnetic waves, which is located between an electromagnetic wave generating source transmitter and a receiving coil or attached to the transmitter and receiving coil. The wireless power conversion charging device includes a rectifying diode for rectifying an electromotive force induced in a construction in which a resonance and impedance matching variable condenser is connected to a coil in series or in parallel in order to transmit maximum induced power to a charging battery that is a load using electromagnetic waves amplified by the amplifying repeater, and a smoothing condenser for smoothing the rectified voltage. Accordingly, charging power required for various small power electronic devices can be provided and power can be supplied to various loads.

TECHNICAL FIELD

The present invention relates to an amplifying repeater, which isconstructed in such a manner that a ferrite core is inserted into a coilwith a predetermined number of winds to increase an inducedelectromotive force caused by an increase in flux linkage using atime-varying magnetic field of electromagnetic waves at a positiondistant from an electromagnetic wave generating source by apredetermined distance, and that the coil and a variable condenser forinducing resonance are connected to each other to intensify and amplifythe magnetic field of electromagnetic waves, and a wireless powerconverter using electromagnetic waves, which is located at apredetermined distance from the amplifying repeater, connects aresonance and impedance matching variable condenser to a coil toeffectively transmit an induced power to a load, and rectifies andsmoothes the induced power using a diode to supply the power to acharging battery or various loads.

BACKGROUND ART

The induced electromotive force obtained from a time variation of themagnetic field of electromagnetic waves using Faraday's law is generatedin proportion to the number of winds of an induction coil and a timevariation of flux linkage. However, the intensity of the magnetic fieldis abruptly decreased in response to a distance from an electromagneticwave generating source. Thus, the induced electromotive force is hardlyinduced to the induction coil at more than a predetermined distance sothat energy according to wireless power conversion cannot be obtained.Furthermore, the induction coil must be disposed within a very shortrange from the electromagnetic wave generating source in a prior art sothat its installation position is greatly restricted or it cannot beinstalled because of its bad appearance.

DISCLOSURE OF INVENTION Technical Problem

Accordingly, the present invention has been made in view of theabove□mentioned problem, and it is an object of the present invention toprovide an electromagnetic wave amplifying repeater, which isconstructed in such a manner that a ferrite core is inserted into a coilwith a predetermined number of winds to increase an inducedelectromotive force caused by an increase in flux linkage using atime-varying magnetic field of electromagnetic waves at a positiondistant from an electromagnetic wave generating source by apredetermined distance, connect the induction coil to a variablecondenser for inducing resonance to construct an amplifying repeaterthat maximizes a current while reducing a resistant component existingin the induction coil to intensify and amplify the magnetic field ofelectromagnetic waves, and to provide a wireless power converter usingthe amplifying repeater, which includes a rectifying diode forrectifying an electromotive force induced in a structure in which aresonance and impedance matching variable condenser is connected inparallel with a coil to effectively transmit an induced electromotiveforce using the electromagnetic waves amplified by the amplifyingrepeater, having a predetermined distance from the amplifying repeater,and a smoothing condenser for smoothing the rectified voltage. Anotherobject of the present invention is to provide an amplifying repeaterlocated at a very short distance from an electromagnetic wave generatingsource or attached to a wireless power converter to intensify andamplify the magnetic field of electromagnetic waves such that theamplifying repeater is installed unrestrictedly and an amplifyingrepeater and wireless power converter are applied in various waysaccording to wireless power conversion using the amplifiedelectromagnetic waves.

Technical Solution

To achieve the above objects, according to the present, there isprovided an electromagnetic wave amplifying repeater capable ofamplifying and repeating the magnetic field of electromagnetic wavesgenerated artificially or generated from various electromagnetic wavegenerating sources, including: an induction coil formed by winding acoil with a predetermined thickness in a desired size and form by apre-determined number of winds; a magnetic substance having apredetermined size and form, the magnetic substance being combined withthe induction coil to increase flux; and a variable condenser connectedto the induction coil to construct a resonance circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

Further objects and advantages of the invention can be more fullyunderstood from the following detailed description taken in conjunctionwith the accompanying drawings, in which:

FIG. 1 illustrates the appearance and configuration of an amplifyingrepeater according to the present invention;

FIG. 2 illustrates a wireless power converter having a charging functionaccording to the present invention;

FIG. 3 illustrates a construction for measuring a charging voltage, acharging current and a charging power using only a wireless powerconverter without using an amplifying repeater;

FIG. 4 illustrates a construction for measuring a charging voltage, acharging current and a charging power using a single magnetic fieldamplifying repeater and a wireless power converter;

FIG. 5 illustrates a construction for measuring a charging voltage, acharging current and a charging power using two magnetic fieldamplifying repeaters and a wireless power converter (combined with oneof the amplifying repeaters);

FIG. 6 illustrates a construction for measuring a charging voltage, acharging current and a charging power using two magnetic fieldamplifying repeaters and a wireless power converter (independent);

FIG. 7 illustrates a construction for measuring a charging voltage, acharging current and a charging power using magnetic field amplifyingrepeaters, a repeating amplifier and a wireless power converter, whichare combined with each other;

FIG. 8 illustrates a construction in which a transmission coil generatesa magnetic field, and a voltage, current and power are measured using anamplifying repeater, a receiving coil and a wireless power converter;

FIG. 9 illustrates a construction in which a transmission coil generatesa magnetic field, and a voltage, current and power are measured at anoutput terminal using an amplifying repeater, a receiving coil wound onthe upper part of a common core, and an amplifying repeater disposed atthe lower part of the common core;

FIG. 10 illustrates a transmitter and a receiver constructed in such amanner that an amplifying repeater and a transmission coil or areceiving coil are wound around a single core;

FIG. 11 illustrates a construction in which an amplifying repeatercomposed of a spiral coil is attached onto a spiral coil, and a voltage,current and power are measured at an output terminal of a receivingcoil;

FIG. 12 illustrates a construction in which an amplifying repeatercomposed of a spiral coil is located between a transmission coil and areceiving coil, and a voltage, current and power are measured at anoutput terminal;

FIG. 13 illustrates a construction in which an amplifying repeater islocated outside a transmission coil, and a voltage, current and powerare measured at an output terminal of a receiving coil; and

FIG. 14 illustrates a construction in which an amplifying repeater islocated outside each of a transmission coil and a receiving coil, and avoltage, current and power are measured at an output terminal of thereceiving coil

-   -   11; Core, 12; Inducing Coil    -   20; AC Power Generator    -   21; Electromagnetic Wave Generating Source    -   22; Receiver 23; Output Part    -   24; Ruler    -   25,26,27,28,30,32,34; Amplifying Repeater    -   29; Transmission Coil    -   31; Receiver1, 33; Receiving Coil    -   51; Spiral Coil Type Receiving Coil    -   52; Spiral Coil Type Amplifying Repeater    -   53; Spiral Coil Type Transmission Coil    -   L1: Receiving Coil,

C1: Condenser for Impedance Matching,

C2: Smoothing Condenser,

-   -   1.3V: Battery Voltage for Charging

MODE FOR THE INVENTION

The present invention will now be described in detail in connection withpreferred embodiments with reference to the accompanying drawings. Forreference, like reference characters designate corresponding partsthroughout several views.

The present invention provides an amplifying repeater, which isconstructed in such a manner that a ferrite core is inserted into a coilwith a predetermined number of winds to increase an inducedelectromotive force caused by an increase in flux linkage using atime-varying magnetic field of electromagnetic waves using Faraday's lawat a position distant from an electromagnetic wave generating source bya predetermined distance and the induction coil and a variable condenserfor inducing resonance are connected to each other to maximize aninduced current while reducing a resistant component existing in theinduction coil to amplify the magnetic field of electromagnetic waves.Furthermore, the present invention provides a wireless power converterlocated at a predetermined distance from the amplifying repeater orattached to the amplifying repeater. The wireless power converterincludes a rectifying diode for rectifying an electromotive forceinduced in a construction in which a magnetic core such as a ferritecore is inserted in an induction coil with a predetermined number ofwinds for transmitting maximum induced power to a charging battery thatis a load using electromagnetic waves amplified by the amplifyingrepeater and the induction coil is connected to a variable condenser forcontrolling resonance and impedance matching, a smoothing condenser forsmoothing the rectified voltage, and a receiving coil having apredetermined DC voltage and current.

In receiving electromagnetic power using Faraday's law, the presentinvention amplifies the magnetic field of time-varying electromagneticwaves generated in a television receiver or a monitor or electromagneticwaves artificially generated by connecting a transmission coil to a loadof an AC power generating circuit using an amplifying repeater to obtainan induced electromotive force using an induction coil at a positiondistant from an electromagnetic wave generating source by apredetermined distance and maximizes the obtained induced voltage andcurrent, to thereby provide a magnetic field amplifying repeater forreceiving electromagnetic power, which enables high efficiency electricenergy conversion, and a high efficiency wireless power converter usingthe amplifying repeater.

The construction of the amplifying repeater for amplifying an inducedmagnetic field of electromagnetic waves will now be described.

The electromagnetic wave amplifying repeater according to the presentinvention obtains an induced electromotive force using electromagneticwaves generated from an electromagnetic wave generating source and emitsthe obtained induced power to the air. The present invention winds acoil round a bobbin having a predetermined diameter and size (having aninternal diameter of 10 mm and an external diameter of 15 mm) by apredetermined number of times and a ferrite core is inserted in thebobbin to manufacture an induction coil. The diameter and the number ofwinds of the induction coil and the size of the ferrite core aredesigned such that the induced electromotive force is maximized. Theinduction coil can be constructed in parallel or in series inconsideration of its resistance value. In the present invention, thediameter and length of the ferrite core are 9 mm and 110 mm,respectively, and two induction coils each have a diameter of 0.3 mm anda number of winds of 160 are connected in parallel with each other. Theinduction coils are wound round the aforementioned bobbin, the ferritecore is inserted into the bobbin and a variable condenser is connectedin parallel with the induction coils to construct a resonance circuit tomaximize induced power and emit electromagnetic waves.

The wireless power converter according to the present invention islocated at a pre-determined distance from the amplifying repeater orattached to the amplifying repeater and includes a ferrite core having adiameter of 9 mm and a length of 110 mm and two induction coils having adiameter of 0.3 mm and a number of winds of 100, connected in parallelwith each other. The induction coils are wound round a bobbin having apredetermined size (an internal diameter of 10 mm and an externaldiameter of 15 mm), the ferrite core is inserted into the bobbin and avariable condenser is connected in parallel with the induction coils toimpedance-match with a resonance and load electronic circuit to maximizean induced electromotive force. The wireless power converter furtherincludes a diode for rectifying the induced electromotive force and asmoothing condenser for smoothing the rectified voltage. The wirelesspower converter can be used as a power supply of a charging devicebecause it generates a DC voltage having a specific current.

FIG. 1 illustrates the electromagnetic field amplifying repeatermanufactured according to the present invention on the left and acircuit constructing the amplifying repeater on the right. FIG. 2 is acircuit diagram of the wireless power converter constructed to obtain anelectric energy using electromagnetic waves amplified by the amplifyingrepeater. In FIG. 2, L1 denotes a receiving coil, C1 represents acapacitor for impedance matching of resonance and maximum powertransmission, C2 denotes a smoothing capacitor, and 1.3V represents acharging battery voltage. Table 1 represents a charging voltage, acharging current and a charging power obtained when the wireless powerconverter of FIG. 2 is located having a predetermined distance from anelectromagnetic wave generating source 21, as shown in FIG. 3, withoutusing the electromagnetic field amplifying repeater. From Table 1, itcan be known that the charging current and charging power are hardlyinduced when the distance of a ruler 24 exceeds 4 cm.

TABLE 1 A charging voltage, a charging current and a charging powerUsing the wireless power converter in FIG. 2. Charging Charging ChargingDistance(cm) Voltage(V) Current (mA) Power(mW) 0 1.3 87 35.1 1 1.3 18.483.9 2 1.3 10.7 13.9 3 1.3 4 5.2 4 1.3 0 0

FIG. 4 illustrates a construction in which a single electromagneticfield amplifying repeater 25 designed and manufactured according to thepresent invention is located in proximity to the electromagnetic wavegenerating source 21 and a charging voltage, a charging current and acharging power are measured using a receiver wireless power converteraccording to the present invention while varying the distance betweenthe electromagnetic field amplifying repeater and the wireless powerconverter. The measurement result is represented in Table 2. Referringto Table 2, the charging current and charging power can be obtained evenat a point at which the distance of the ruler is approximately 10 cm.

TABLE 2 A charging voltage, a charging current and a charging powerUsing the wireless power converter in FIG. 4. Charging Charging ChargingDistance(cm) Voltage(V) Current (mA) Power(mW) 5 1.3 44.0 57.2 6 1.326.2 34.1 7 1.3 21.7 28.2 8 1.3 15.7 20.4 9 1.3 10.7 13.9 10 1.3 4.9 6.411 1.3 0 0 12 1.3 0 0

FIG. 5 illustrates a construction using two electromagnetic fieldamplifying repeaters 25 and 26 according to the present invention. Oneof the amplifying repeaters is located having a predetermined distancefrom the electromagnetic wave generating source 21 and the other one isdisposed in proximity of the receiver 22 and the wireless powerconverter. Here, the amplifying repeater 26 and the receiver 22 arecombined with each other. Table 3 represents a charging voltage, acharging current and a charging power measured using this constructionwhile varying the distance between the electromagnetic wave generatingsource and the amplifying repeater 26 and the receiver 22 attached toeach other. Referring to Table 3, the charging current and chargingpower can be obtained even at a point distant from the electromagneticwave generating source 21 by 12 cm.

TABLE 3 A charging voltage, a charging current and a charging powerUsing the wireless power converter in FIG. 5. Charging Charging ChargingDistance(cm) Voltage(V) Current (mA) Power(mW) 5 1.3 51.2 66.5 6 1.336.8 47.8 7 1.3 29.2 37.9 8 1.3 21.4 27.8 9 1.3 16.6 21.5 10 1.3 12.716.5 11 1.3 4.7 6.1 12 1.3 1.2 1.6

FIG. 6 illustrates a construction using two electromagnetic fieldamplifying repeaters 25 and 27 designed and manufactured according tothe present invention. In this construction, one of the amplifyingrepeaters is located having a predetermined distance from theelectromagnetic wave generating source 21, the other one is disposedhaving a distance of 5 cm from the electromagnetic wave generatingsource 21, and a charging voltage, a charging current and a chargingpower are measured using the wireless power converter while varying thedistance between the wireless power converter and the amplifyingrepeaters. Table 4 represents the measurement result. Referring to Table4, a slightly increased charging power can be obtained and a specificcharging current and charging power can be obtained even at a pointdistant from the electromagnetic wave generating source 21 by 13 cm.

TABLE 4 A charging voltage, a charging current and a charging powerUsing the wireless power converter in FIG. 6. Charging Charging ChargingDistance(cm) Voltage(V) Current (mA) Power(mW) 10 1.3 34 44.2 11 1.322.3 29.0 12 1.3 6.3 8.2 13 1.3 1.7 2.2

FIG. 7 illustrates a construction in which an electromagnetic fieldamplifying repeater 25 is manufactured in such a manner that a coilhaving the same diameter as the aforementioned coil is wound round abobbin having the same size as the afore-mentioned bobbin by a number ofwinds of 200 to connect two induction coils in parallel, a ferrite coreis inserted into the induction coils and a variable condenser isconnected in parallel with the induction coils to construct a resonancecircuit, and the amplifying repeater 25 is located having apredetermined distance from the electromagnetic wave generating source21. In addition, another amplifying repeater 27 identical to those usedin FIGS. 3, 4, 5 and 6 is located at a point corresponding to 5 cm ofthe ruler, and an amplifying repeater 28 and the wireless powerconverter are attached to each other to measure a charging voltage, acharging current and a charging power while varying the distance betweenthe electromagnetic wave generating source and the wireless powerconverter. Table 5 represents the measured charging voltage, chargingcurrent and charging power. It can be known from Table 5 that a specificcharging current and charging power can be obtained even at a pointdistant from the electromagnetic wave generating source 21 by 16 cm.

TABLE 5 A charging voltage, a charging current and a charging powerUsing the wireless power converter in FIG. 7. Charging Charging ChargingDistance(cm) Voltage(V) Current (mA) Power(mW) 10 1.3 41.0 53.3 11 1.329.8 38.7 12 1.3 20.2 26.2 13 1.3 15.8 20.5 14 1.3 10.7 13.9 15 1.3 3.24.1 16 1.3 1 1.3

Various experiments were made using the electromagnetic field amplifyingrepeater designed and manufactured as above and the wireless powerconverter according to the present invention, as shown in FIGS. 3through 7. In the case where only the wireless power converter isinstalled without having the amplifying repeater, as shown in FIG. 3,the induced electromotive force is hardly generated from the inductioncoil when the wireless power converter is located distant from theelectromagnetic wave generating source by 4 cm, as represented inTable 1. Thus, a charging current does not flow in a charging batterythat is a load and charging battery power indicates zero. In the casewhere the amplifying repeater is added, as shown in FIG. 4, the maximumcharging current of 44 mA and charging power of 57.2 mW are obtainedwhen the wireless power converter is located distant from theelectromagnetic wave generating source by 5 cm and charging power of 6.4mW is obtained when the wireless power converter is located distant fromthe electromagnetic wave generating source by 10 cm, as represented inTable 2.

When the wireless power converter is combined with the amplifyingrepeater, as shown in FIG. 5, the charging current and charging powerare higher than those obtained from the construction of FIG. 4 at thesame distance. When the two amplifying repeaters are used as shown inFIG. 6, the charging power at the point distant from the electromagneticwave generating source by 10 cm is 44.2 mW as represented in Table 4,which is approximately seven times the charging power of 6.4 mW obtainedusing only one amplifying repeater in FIG. 4. Furthermore, the chargingcurrent and charging power can be obtained even at a point distant fromthe electromagnetic wave generating source by a distance correspondingto 12 cm of the ruler. Thus, it can be known that electromagnetic poweris transmitted and induced-converted into an electrical energy to betransmitted to a load even at a distance four times the distance whenthe wireless power converter is used without using any amplifyingrepeater.

In the construction in which two different amplifying repeaters 25 and27 are in stalled and the amplifying repeater 28 is combined with areceiving coil and the wireless power converter, as shown in FIG. 7,increased charging current and charging power are measured at the samedistance in the construction having no amplifying repeater of FIG. 6 anda distance capable of obtaining the charging current and charging poweris increased to 16 cm, as represented in Table 5.

In another embodiment of the present invention, a transmission coil isconnected to a load of an AC power generating circuit of a TV receiver,which is an artificial electromagnetic generating source, to construct asource of generating AC power waveform having a frequency of 130 kHz,and the transmission coil, a repeater and coils used in first and secondreceivers are constructed, as shown in Table 6, to measure a receivingvoltage, a receiving current and a receiving power in response to aruler distance using the wireless power converter of FIG. 2.

TABLE 6 Coil Construction of Transmission coil, Repeater, Receiver1,Receiver2 Transmission Repeat- Coil er Receiver1 Receiver2 Coil 0.3 0.30.3 0.3 Core(mm) 9*55 7*45 7*45 7*45 (Dia.*Length) No. of 40

40

15 Upper winding Receiver(10Times) Lower Repeater(40Times)

In Table 6, the first receiver is constructed of a general solenoid coilconstructed such that a coil is wound round a core and the secondreceiver includes a receiving coil wound round the upper part of acommon core ten times and a repeater constructing a resonance circuit ofa coil wound round the lower part of the common core forty times and acapacitor.

FIG. 10 illustrates a transmitter and a receiver constructed by windinga transmission coil outputting power generated from the electromagneticwave generating source or a receiving coil receiving electromagneticwaves round a common core provided with an electromagnetic waveamplifying repeater. This construction can obtain high wireless powerconversion efficiency because it can maximize generation and receptionof electromagnetic waves in the resonance circuit of the amplifyingrepeater.

Table 7 represents the voltage, current and power measured at an outputload terminal (tens of parallel LEDs) of a receiver 31 when atransmission coil 29, an amplifying repeater 30 and the receiver 31manufactured as shown in Table 6 are installed as shown in FIG. 8. Theamplifying repeater is located in proximity to an electromagnetic wavegenerating source. The voltage, current and power are measured whilemoving the receiver from the electromagnetic wave generating source todistances 5 cm, 10 cm and 15 cm.

TABLE 7 A receiving voltage, current and power measured at an outputload terminal of a receiver1. Receiving voltage Receiving CurrentReceiving Distance(cm) (V) (A) Power(W) 5 3.9 1.900 7.410 10 2.6 1.0002.600 15 1.4 0.200 0.280

Table 8 represents the voltage, current and power measured at an outputload terminal of receivers 33 and 34 when the transmission coil 29,amplifying repeater 32 and receivers 33 and 34 manufactured as shown inTable 6 are installed as shown in FIG. 9. The amplifying repeater islocated in proximity to an electromagnetic wave generating source. Thevoltage, current and power are measured while moving the receivers fromthe electromagnetic wave generating source to distances 5 cm, 10 cm, 15cm and 20 cm.

TABLE 8 A receiving voltage, current and power measured at an outputload terminal of a receiver2. Receiving voltage Receiving CurrentReceiving Distance(cm) (V) (A) Power(W) 5 4.6 3.500 16.100 10 4.4 3.50015.400 15 2.7 1.700 4.590 20 2.0 0.700 1.400

It can be known from Tables 7 and 8 that the receiving voltage,receiving current and receiving power in response to a distance are muchlarger when they are obtained using the receiver 31 manufactured bywinding only an induction coil round a core than when they are obtainedusing the receivers 33 and 34 including an induction coil and a repeaterconstructed of a resonance circuit, which are attached to a singlecommon core.

Another embodiment of the present invention constructs induction coilsby winding coils having various diameters round bobbins having varioussizes by different numbers of winds in consideration of the size andscale of an electromagnetic wave generating source, connects theinduction coils in series or in parallel, inserts ferrite cores havingdiameters and lengths fitted into the internal diameters of the bobbins,and connects the induction coils to a variable condenser to construct aresonance circuit. In this manner, an electromagnetic field amplifyingrepeater can be constructed in various sizes and forms and an apparatuscapable of obtaining charging voltage, charging current and chargingpower with various levels can be realized using the amplifying repeaterand the wireless power converter.

Another embodiment of the present invention constructs a transmissioncoil, a repeater and a receiver using the spiral structure disclosed inKorean Patent Application No. 10-2004-0000528 applied by the Applicant.In this case, an electromagnetic wave generating source that generates avoltage of AC 220V and 60 Hz converted into an AC voltage waveformhaving a frequency of 120 kHz through an AC-AC adapter is connected tothe transmission coil in a spiral form, a receiving coil is connected toa charging circuit, and a received charging current and voltage aremeasured. The distance between the transmission coil and the receivingcoil is 5 cm. FIG. 11 shows a case where the amplifying repeater islocated on the transmission coil in proximity to the transmission coil.Table 9 represents the internal diameters, external diameters, types andnumbers of winds of the spiral transmission coil, repeater coil andreceiving coil.

TABLE 9 Internal diameters, external diameters, types and numbers ofwinds of the spiral transmission coil, repeater coil and receiving coil.Internal External Coil Numbers diameters (mm) diameters (mm) spec. ofwinds Receiving 30 80 0.2*9 24 coil Repeater 30 80 0.2*9 24 coilTransmission 30 40 0.2*9 4 coil

In FIG. 11, transmission power output through the transmission coil ofthe electromagnetic wave generating source is 16 W, charging voltagemeasured by the wireless power converter of FIG. 2 is 1.4V, chargingcurrent is 0.36 A, and charging power is 0.50 W. When the amplifyingrepeater is located between the transmission coil and the receiver,which are spiral coils having the dimension represented in Table 6, asshown in FIG. 12, charging voltage is 1.4V, charging current is 0.4 Aand charging power is 0.56 W. In this case, current and power slightlyhigher than those obtained in the case of FIG. 11 can be obtained. Forreference, when only the transmission coil 53 and receiving coil 51 areused without using the repeater and the distance between thetransmission coil and the receiving coil is 5 cm, charging voltage is1.4V, charging current is 0.01 A and charging power is 0.014 W, whichare very small.

FIG. 13 shows a case where the amplifying repeater surrounds thetransmission coil. Here, the repeater is not connected to thetransmission coil through wire. Table 10 represents the internaldiameters, external diameters, types and numbers of winds of the spiraltransmission coil, repeater and receiver used in the construction shownin FIG. 13.

In FIG. 13, transmission power output through the transmission coil ofthe electromagnetic wave generating source is 16 W, charging voltagemeasured by the wireless power converter of FIG. 2 is 1.4V, chargingcurrent is 0.9 A, and charging power is 1.26 W. When the amplifyingrepeaters respectively surround the transmission and receiving coils,which are spiral coils having the dimension of Table 10, as shown inFIG. 14, charging voltage is 1.4V, charging current is 1.0 A andcharging power is 1.4 W. That is, the highest current and power can beobtained in the experiments using the spiral coils. Here, the distancebetween the transmission coil and the receiving coil is 5 cm.

TABLE 10 Internal diameters, external diameters, types and numbers ofwinds of the spiral transmission coil, repeater coil and receiving coil.Internal External Coil Numbers diameters (mm) diameters (mm) spec. ofwinds Receiving coil 30 80 0.2*9 24 Repeater 40 80 0.2*9 20 coilTransmission 30 40 0.2*9 4 coil

Furthermore, the present invention can construct a wireless chargingdevice that generates an induced voltage and current with highefficiency and charges the induced voltage and current in a chargerusing a rectifying diode and a smoothing condenser by simultaneouslywinding two wires of the spiral coil disclosed in Korea PatentApplication No. 10-2004-0000528 in the form of plate such that they arelocated in parallel vertically, placing a ferromagnetic substance in adoughnut shape on the coil in order to increase flux caused by fluxlinkage per hour and connecting a variable condenser to the coil inseries or in parallel to construct a resonance circuit. Here, anelectromagnetic field amplifying repeater can be manufactured byconstructing the resonance circuit using the spiral plate type coil,ferromagnetic substance in a doughnut shape and variable condenser. Amethod of manufacturing the electromagnetic field amplifying repeater isdescribed in detail in Korea Patent Application No. 10-2004-0000528.

The present invention constructs a magnetic field amplifying repeaterfor amplifying a magnetic field at a position having a predetermineddistance from an electromagnetic wave generating source and locates anelectromagnetic wave amplifying repeater and a wireless power conversioncharging device converter at a position distant from the amplifyingrepeater by a predetermined distance. The wireless power conversioncharging device include a rectifying diode that rectifies anelectromotive force induced in a structure in which a resonance andimpedance matching variable condenser and a coil are connected inparallel with each other to induce maximum power using electromagneticwaves amplified by the amplifying repeater to transmit the induced powerto a load and a smoothing condenser smoothing the rectified voltage anda wireless power. Accordingly, the present invention can repeat power toa predetermined distance from the electromagnetic wave generating sourceand convert electromagnetic power to improve industrial applicability.For example, the present invention can be used to charge contactlesswireless battery or transmit power in real time at a short distance inthe air or an insulator of a small power electronic device.

The present invention can locate the magnetic field amplifying repeaterat a position having a predetermined distance from the electromagneticwave generating source to install the wireless power converter usingelectromagnetic waves, and thus the wireless power converter can befreely located and applied in various ways.

While the present invention has been described with reference to theparticular illustrative embodiments, it is not to be restricted by theembodiments but only by the appended claims. It is to be appreciatedthat those skilled in the art can change or modify the embodimentswithout departing from the scope and spirit of the present invention.

1. An electromagnetic wave amplifying repeater capable of amplifying andrepeating the magnetic field of electromagnetic waves generatedartificially or generated from various electromagnetic wave generatingsources, comprising: an induction coil formed by winding a coil with apredetermined thickness in a desired size and form by a predeterminednumber of winds; a magnetic substance having a predetermined size andform, the magnetic substance being combined with the induction coil toincrease flux; and a variable condenser connected to the induction coilto construct a resonance circuit.
 2. The electromagnetic wave amplifyingrepeater as claimed in claim 1, wherein the induction coil wound by thepredetermined number of winds is designed and manufactured in a solenoidor spiral form.
 3. The electromagnetic wave amplifying repeater asclaimed in claim 1, wherein the magnetic substance combined with theinduction coil to increase flux is a ferrite core or a substance havingmagnetism.
 4. The electromagnetic wave amplifying repeater as claimed inclaim 3, wherein induction coils wound by a predetermined number ofwinds are connected in series or in parallel to control the resistanceand inductance of the induction coils, to thereby effectively generatethe magnetic field of electromagnetic waves.
 5. The electromagnetic waveamplifying repeater as claimed in claim 4, wherein the variablecondenser constructing the resonance circuit is connected to theinduction coil in series or in parallel to amplify the magnetic field ofelectromagnetic waves.
 6. A wireless power converter comprising: anelectromagnetic wave amplifying repeater including an induction coilformed by winding a coil with a predetermined diameter in a desired sizeand form by a predetermined number of winds, a magnetic substance, and avariable condenser, the electromagnetic wave amplifying repeater servingto amplify and repeat the magnetic field of electromagnetic wavesgenerated artificially or generated from various electromagnetic wavegenerating sources; an induction coil and a magnetic substance forgenerating an induced electromotive force using the magnetic fieldamplified by the amplifying repeater; a variable condenser forperforming resonance and impedance matching, the variable condenserbeing connected to the induction coil to improve power conversionefficiency; a rectifying diode for rectifying a voltage induced by theinduction coil and the variable condenser; and a condenser for smoothingthe voltage to form a voltage having a desired DC component.
 7. Thewireless power converter as claimed in claim 6, wherein induction coilswound by a predetermined number of winds are connected in series or inparallel to control the resistance and inductance of the inductioncoils, to thereby improve power conversion efficiency.
 8. The wirelesspower converter as claimed in claim 6, wherein the amplifying repeateris attached to an electromagnetic wave generating source transmissioncoil and a receiving coil or to one of the electromagnetic wavegenerating source transmission coil and the receiving coil, and at leastone amplifying repeater is installed between the electromagnetic wavegenerating source transmission coil and the receiving coil inconsideration of the distance between the electromagnetic wavegenerating source and the receiving coil.
 9. The wireless powerconverter as claimed in claim 8, wherein the amplifying repeater and thereceiving coil are designed and manufactured in a solenoid or spiralform.
 10. The wireless power converter as claimed in claim 6, whereinthe amplifying repeater and the wireless power converter including theamplifying repeater further comprise an electromagnetic wave generatingsource to which a spiral or solenoid transmission coil artificiallygenerating electromagnetic waves is attached.
 11. The wireless powerconverter as claimed in claim 6, wherein the wireless power converter isconstructed in such a manner that an induction coil is wound round oneside of a core wound by a transmission coil of an artificialelectromagnetic wave generating source and the induction coil isconnected to a capacitor to construct an amplifying repeater, that aninduction coil is wound round one side of a core wound by a receivingcoil and the induction coil is connected to a capacitor to construct anamplifying repeater, or that amplifying repeaters are respectively setat both sides of the core of the transmission coil and receiving coil.12. The wireless power converter using an electromagnetic waveamplifying repeater as claimed in claim 6, wherein the wireless powerconverter is constructed in such a manner that a spiral coil is woundround the outside of a transmission spiral coil of an artificialelectromagnetic wave generating source and connected to a capacitor toconstruct an amplifying repeater, that a spiral coil is wound round theoutside a receiving spiral coil and connected to a capacitor toconstruct an amplifying repeater, and that spiral coils are respectivelywound around the outsides of transmission and receiving spiral coils andconnected to a capacitor to construct an amplifying repeater.